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Finding the Fourth Proportional to 20,620.64, 30,905.04 and 14,788.64

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Solution

The fourth proportional to 20,620.64, 30,905.04 and 14,788.64 is: 22,164.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,620.64 : 30,905.04 = 14,788.64 : x
  2. Step 2: Convert to fraction form
    20,620.64/30,905.04 = 14,788.64/x
  3. Step 3: Cross multiply
    20,620.64x = 30,905.04 × 14,788.64
  4. Step 4: Simplify right side
    20,620.64x = 457,043,510.75
  5. Step 5: Solve for x
    x = 457,043,510.75/20,620.64
  6. Step 6: Final answer
    x = 22,164.37

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.